Anyone do this? I read at some point somewhere that the workers need to be on the same LAN as the master, but I am not seeing that in the FMS configuration guide. If this is true how does this get setup on AWS?
Multiple servers on the same subnet is supported in AWS via VPCs (Virtual Private Clouds).
You can configure worker machines to be on a different subnet (EG worker machine outside of the firewall in a DMZ, filemaker server behind), however performance will definitely be affected negatively if the servers can't communicate quickly.